Best way to open files in Python

C like syntax is as follows,

f = open("file", 'r')
line = f.readline( )
print line
close(f)

some one may forget to close f. this leads to leak, which is considerable in large scale programs. in order to avoid that we  can make use of 'with' or 'for' keywords.


with open("file", 'r') as f:
        line = f.readline()
        print line
or

for line in open("file", 'r'):
       print line


in these scenarios, file will get closed when f is out of scope.